Carburetor



Cfr

tion 21 ot' the valve 9,() and passage 2i). into the manifold.

lt will he understoml that a great amount ot suetion will he exerted within the upper portion of the bore 1T and with a 'View of' reliewnnrthis to a eertain extent, and thinningr the mixture produeed by the nozzle i8 and` air Aentering4 through the passage 19, l eonvenientl)v provide a second passage 23 whieh has its upper end in Communieation with the mixing' chamber of the housing' ll, its opposite end terminating' adjarent the hodv ol' the valve 20, wlieh valve at this point is eonvenientljvY prrvivided with a transversel \1 extendingV horeZ-leoinlnunieating; with a groove 2,5 in turn communicating with the main groove 2L lt will he appreeiated that the suction upon the nozzle lla' may he broken to a lrenter or less extent upon the hodyv il() ot' the valve heine turned so as to provide eomniunieation to a `greater or less extent het'ween the transverseh] extending hore 2l and the `gjroove 721, i. e. to permit oi' a r(greater or less amount ol air heinfej introdueed into 'the mixture. 'whieh air is received 'troni the mixing eliainher l2 and the housing; ll.

Now with a view ol providing' nieans whirh will serve to produee au ellieient mixture when the engine is unloaded it will he noted that the duet is extended bevond the liore li' ot' the housin; r

through the.

il. and terminates in eonnnunieation with the serond nozzle 26 rentrallir positioned within the housing' ll. and suhsediientlv adjaeent the point ol greatest eoustrietion ol. the venturi lo. n opening' is provided in the fare oi the mi ing ehaniher l2. wlrieh opening' leads into a passage ZT in 'onirnunieation with the lower end ol the nozzle 26. i

eontrolling' phuf or an desirahle tvpe ol' valve 2H ispositioned within the hase ol the nozzle 2U. and adjaeent the outlet ot the passage 21 and this plu;r or valve is l'orined with a restrieted passage as indi4 rah-d at 2). for a purpose hereinafter more, l'ullj' speeiiied,

li is now to he appreriated that air will enter through the inlet ll. and when the throttle valve l' opened. the air drawn through he venturi lo will eause a suetion sullirient to draw i`uel l'roni the nozzle 2S to produce a mixture.

Lauream.

in opi-ratingr` the atmosphere adjacent the 'greatest point of eonstrietion oit the venturi on the l`uel passingr through the latter plug.

thereby preventing an excessive 'flow ot' l'lnid at high engine speeds By virtue ot the iaet that the passage 2T is connected to the inixingf eharnher l2, and te a point interrnediate the plug and sprayY no zzle 26, the suction on the calibrated plug; can for this reason at no time exceed the suetion in the mixing' ehaxnher l2 plus the fluid friction in the, passage 2T. Secondly. an aerating' and hrealrinle` up ot the fuel to a certain extent prior to its ejection trom the nozzle 2G insured so that upon the air striking' the partieles of the saine with treat velocity, a linely subdivided mixture will he produeed.

Obviously numerous modifications ot strneture might. he resorted to Without in the least departing 'from the seope of my elainisl whieh readl elaini:

il, earhuretor ineluding' a eonstant-level tuel ehamher`r a hody providingv a mixture luiseaee7 f Venturi tnhe ffnniinfev a portion ol' said mixture passage, a nozzle extending to a point in said Venturi tuhe slightly ahove the normal tuel level and fed from said eonstant level elian'iher, a flow-eon trolling ineans in the passage eonneetinrr said eonstant level ehamher and said nozzle and suhstantiall;Y helow they lnel eharnber level. and mea-ns providing a passage having its upper end eonnnunica-ting with the nii.\'- ture passage at a point beyond the most eonstrieted portion ol' the Venturi luhe and its lower end eornniunieating with the nozzle at a point hetween its disr'hargfe oriliee and the lio\v- 'ontrolling;v neans and suhstantiall'v helow the normal level in the. Yliuel 

